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2 years ago

Please answer 6 and 7

Mathematics

1 answer:

sleet_krkn [62]2 years ago

8 0

Answer:

ok aaj SGD Hv the best of my friends in a couple days of a sudden in

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Solve for x in the equation.

labwork [276]

Answer:

The solution is $\displaystyle x=1\pm \sqrt{47}$ . Fourth option

Explanation:

Solve for x:

$2x^2+3x-7=x^2+5x+39$

Move all the terms from the right to the left side of the equation, a zero in the right side:

$2x^2+3x-7-x^2-5x-39=0$

Join all like terms:

$x^2-2x-46=0$

The general form of the quadratic equation is:

$ax^2+bx+c=0$

Solve the quadratic equation by using the formula:

$\displaystyle x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

In our equation: a=1, b=-2, c=-46

Substituting into the formula:

$\displaystyle x=\frac{-(-2)\pm \sqrt{(-2)^2-4(1)(-46)}}{2(1)}$

$\displaystyle x=\frac{2\pm \sqrt{4+184}}{2}$

$\displaystyle x=\frac{2\pm \sqrt{188}}{2}$

Since 188=4*47

$\displaystyle x=\frac{2\pm \sqrt{4*47}}{2}$

Take the square root of 4:

$\displaystyle x=\frac{2\pm 2\sqrt{47}}{2}$

Divide by 2:

$\displaystyle x=1\pm \sqrt{47}$

First option: Incorrect. The answer does not match

Second option: Incorrect. The answer does not match

Third option: Incorrect. The answer does not match

Fourth option: Correct. The answer matches exactly this option

8 0

2 years ago

A city with a population of 800,000 has been growing at a rate of 7% per year. If this rate continues, find the population of th

Contact [7]

Answer:

Step-by-step explanation:

Population(pop) = 800,000 people

Growth rate=7℅

Pop growth in a year= ((100+7)÷100) × 800000 =856000people

Pop in 20 years = 856000×20

=17,120,000 people

4 0

2 years ago

Simplify: -3152 – 10(4.32 + 5 = 5)]

zheka24 [161]

Answer:-523/52

Step-by-step explanation:

4 0

3 years ago

If the farm has 30 chickens and cows, and there are 82 chicken and cow legs all together, then how many chickens and how many co

natima [27]

There would be 11 cows and 19 chickens

3 0

3 years ago

Read 2 more answers

ACDF,BE is a mid segment what is x?

Ksenya-84 [330]

Answer:

X= 15

Step-by-step explanation:

the above equation will be used to determine the value of x.

6x-12= 2x+20+18

6x-2x = 20+12+18

4x= 60.

X= 60/4

X= 15

x = 15

7 0

3 years ago